I am by no means an expert nor do I claim to be but I did notice two things in the video that may help.
Your brother needs to be ready with the gun prior to the shot. By this I mean the gun in position for the shot. He brought the gun up to mid-section and then to shoulder in two separate motions. This will create head lift from the stock which always leads to over the top on the bird. Ben's gun was also very stationary at the shots.--No movement is no lead.
Second point is harder to do and to take for you Nate. I was a certified hunter safety instructor for years and trap team captain for about as long. Ben needs to hit the trap range. Now that he has seen wild bird flushes, Ben can appreciate and apply the lead and different angles to the trap which will be the same principles he will apply on Ralphie ringneck.
The last point is the toughest for me to share as I have grown quite fond of you Nate over the last several years. Never--and I mean never--speak/shout out as Ben is attempting to shoot birds. This distraction will divert his focus and always lead to swing through, cheek down or other needed movements to be lost. I am saying that it feels right to "cheer on" but the results are always less than desirable.
When my boys became "competitive" and sometimes won the trap meets they participated in--I soon became aware that I needed no "cheering" to assist them on what had already become automatic for them. Think about me and you Nate--what we do from point to flush to shot is automatic. Ben must become automatic as well!
Sorry for the length but gun management and safety have always been my passion! Really my life!
Two doubles this year--3 natural triples in my memories--helluva lot easier to do in the 60's and 70's.